Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a180db38e1ab6f…

MALICIOUS

PDF

87.5 KB Created: 2021-08-23 17:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b9ec8c6beb9af0b4a38aeee6875bffa SHA-1: 7df8a4bec6f46bf4c17e84e4e9d92745975b2a72 SHA-256: 49a180db38e1ab6ffeea98a1e47cbc508c92712501064c44067be066ac6399d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103be4490105---35693480418.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c286d28e78---zarururulenogutunelabel.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25bf60bdfc---turadotubojibakosilul.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/2153298225.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/zutofefuj.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a8647e81006c9c72953573d7fa79cff5/sadirujolirimitepaxufir.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/gositakot.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2469d5be3c3a062796670bba3b018eb4/lakuxafisugebu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0887f8382e4c87dbf16b64c139dcff6c/10001261874.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f984b6d8613bc304e5a9f4c5181e904a/fomirojuvoj.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/1805250494.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/11914131344.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/55481d453263d0ff121fc1a95a8e0a14/mipogipikolovasarelu.pdfIn PDF document text
    • https://wittnebel.dk/file/ruzekenokiz.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/gijiwezisigifozuruzulozu.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/wavolutalebedazosuzuturo.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/11b212ec31b142e3d6b2bfd53d7f23a1/47394239891.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/42765977164.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/tapavab.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/44535045643.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ed6d9c45ee29113a758a8d2410c3a0e2/nupexidebifije.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/27769467764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tolstoy%27s+the+death+of+ivan+ilyichPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 16812 bytes
SHA-256: 504a31ea551eb9b289a4d2b6ec2cc8d40b0b1e6b367138152df886637deb3d2d
font_01_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 10652 bytes
SHA-256: 2d259f366cecac8f0758ab245c13a6b3c77fbcc1a90391bc683fc6f2bec57597
font_02_sfnt_off0001358e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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